X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fs390%2Fblock%2Fdasd_devmap.c;h=5943266152f5ec899de2f5a8a98b435328ff8872;hb=refs%2Fheads%2Fvserver;hp=1629b27c48ab7d57a73e433156269a323d4a900e;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index 1629b27c4..594326615 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -13,9 +13,9 @@ * */ -#include #include #include +#include #include #include @@ -25,8 +25,8 @@ #include "dasd_int.h" -kmem_cache_t *dasd_page_cache; -EXPORT_SYMBOL(dasd_page_cache); +struct kmem_cache *dasd_page_cache; +EXPORT_SYMBOL_GPL(dasd_page_cache); /* * dasd_devmap_t is used to store the features and the relation @@ -44,8 +44,25 @@ struct dasd_devmap { unsigned int devindex; unsigned short features; struct dasd_device *device; + struct dasd_uid uid; }; +/* + * dasd_server_ssid_map contains a globally unique storage server subsystem ID. + * dasd_server_ssid_list contains the list of all subsystem IDs accessed by + * the DASD device driver. + */ +struct dasd_server_ssid_map { + struct list_head list; + struct system_id { + char vendor[4]; + char serial[15]; + __u16 ssid; + } sid; +}; + +static struct list_head dasd_server_ssid_list; + /* * Parameter parsing functions for dasd= parameter. The syntax is: * : (0x)?[0-9a-fA-F]+ @@ -62,6 +79,8 @@ struct dasd_devmap { int dasd_probeonly = 0; /* is true, when probeonly mode is active */ int dasd_autodetect = 0; /* is true, when autodetection is active */ +int dasd_nopav = 0; /* is true, when PAV is disabled */ +EXPORT_SYMBOL_GPL(dasd_nopav); /* * char *dasd[] is intended to hold the ranges supplied by the dasd= statement @@ -69,8 +88,10 @@ int dasd_autodetect = 0; /* is true, when autodetection is active */ * strings when running as a module. */ static char *dasd[256]; +module_param_array(dasd, charp, NULL, 0); + /* - * Single spinlock to protect devmap structures and lists. + * Single spinlock to protect devmap and servermap structures and lists. */ static DEFINE_SPINLOCK(dasd_devmap_lock); @@ -119,7 +140,7 @@ static inline int dasd_busid(char **str, int *id0, int *id1, int *devno) { int val, old_style; - + /* check for leading '0x' */ old_style = 0; if ((*str)[0] == '0' && (*str)[1] == 'x') { @@ -175,12 +196,14 @@ dasd_feature_list(char *str, char **endp) features = 0; while (1) { - for (len = 0; + for (len = 0; str[len] && str[len] != ':' && str[len] != ')'; len++); if (len == 2 && !strncmp(str, "ro", 2)) features |= DASD_FEATURE_READONLY; else if (len == 4 && !strncmp(str, "diag", 4)) features |= DASD_FEATURE_USEDIAG; + else if (len == 6 && !strncmp(str, "erplog", 6)) + features |= DASD_FEATURE_ERPLOG; else { MESSAGE(KERN_WARNING, "unsupported feature: %*s, " @@ -224,24 +247,34 @@ dasd_parse_keyword( char *parsestring ) { length = strlen(parsestring); residual_str = parsestring + length; } - if (strncmp ("autodetect", parsestring, length) == 0) { + if (strncmp("autodetect", parsestring, length) == 0) { dasd_autodetect = 1; MESSAGE (KERN_INFO, "%s", "turning to autodetection mode"); return residual_str; } - if (strncmp ("probeonly", parsestring, length) == 0) { + if (strncmp("probeonly", parsestring, length) == 0) { dasd_probeonly = 1; MESSAGE(KERN_INFO, "%s", "turning to probeonly mode"); return residual_str; } - if (strncmp ("fixedbuffers", parsestring, length) == 0) { + if (strncmp("nopav", parsestring, length) == 0) { + if (MACHINE_IS_VM) + MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM"); + else { + dasd_nopav = 1; + MESSAGE(KERN_INFO, "%s", "disable PAV mode"); + } + return residual_str; + } + if (strncmp("fixedbuffers", parsestring, length) == 0) { if (dasd_page_cache) return residual_str; dasd_page_cache = - kmem_cache_create("dasd_page_cache", PAGE_SIZE, 0, - SLAB_CACHE_DMA, NULL, NULL ); + kmem_cache_create("dasd_page_cache", PAGE_SIZE, + PAGE_SIZE, SLAB_CACHE_DMA, + NULL, NULL ); if (!dasd_page_cache) MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " "fixed buffer mode disabled."); @@ -290,6 +323,8 @@ dasd_parse_range( char *parsestring ) { features = dasd_feature_list(str, &str); if (features < 0) return ERR_PTR(-EINVAL); + /* each device in dasd= parameter should be set initially online */ + features |= DASD_FEATURE_INITIAL_ONLINE; while (from <= to) { sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); @@ -355,7 +390,7 @@ dasd_parse(void) * Add a devmap for the device specified by busid. It is possible that * the devmap already exists (dasd= parameter). The order of the devices * added through this function will define the kdevs for the individual - * devices. + * devices. */ static struct dasd_devmap * dasd_add_busid(char *bus_id, int features) @@ -364,11 +399,11 @@ dasd_add_busid(char *bus_id, int features) int hash; new = (struct dasd_devmap *) - kmalloc(sizeof(struct dasd_devmap), GFP_KERNEL); + kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); if (!new) return ERR_PTR(-ENOMEM); spin_lock(&dasd_devmap_lock); - devmap = 0; + devmap = NULL; hash = dasd_hash_busid(bus_id); list_for_each_entry(tmp, &dasd_hashlists[hash], list) if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { @@ -380,10 +415,10 @@ dasd_add_busid(char *bus_id, int features) new->devindex = dasd_max_devindex++; strncpy(new->bus_id, bus_id, BUS_ID_SIZE); new->features = features; - new->device = 0; + new->device = NULL; list_add(&new->list, &dasd_hashlists[hash]); devmap = new; - new = 0; + new = NULL; } spin_unlock(&dasd_devmap_lock); kfree(new); @@ -434,8 +469,7 @@ dasd_forget_ranges(void) spin_lock(&dasd_devmap_lock); for (i = 0; i < 256; i++) { list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { - if (devmap->device != NULL) - BUG(); + BUG_ON(devmap->device != NULL); list_del(&devmap->list); kfree(devmap); } @@ -454,7 +488,7 @@ dasd_device_from_devindex(int devindex) int i; spin_lock(&dasd_devmap_lock); - devmap = 0; + devmap = NULL; for (i = 0; (i < 256) && !devmap; i++) list_for_each_entry(tmp, &dasd_hashlists[i], list) if (tmp->devindex == devindex) { @@ -495,17 +529,17 @@ dasd_create_device(struct ccw_device *cdev) { struct dasd_devmap *devmap; struct dasd_device *device; + unsigned long flags; int rc; devmap = dasd_devmap_from_cdev(cdev); if (IS_ERR(devmap)) return (void *) devmap; - cdev->dev.driver_data = devmap; device = dasd_alloc_device(); if (IS_ERR(device)) return device; - atomic_set(&device->ref_count, 2); + atomic_set(&device->ref_count, 3); spin_lock(&dasd_devmap_lock); if (!devmap->device) { @@ -524,6 +558,11 @@ dasd_create_device(struct ccw_device *cdev) dasd_free_device(device); return ERR_PTR(rc); } + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + cdev->dev.driver_data = device; + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return device; } @@ -541,11 +580,11 @@ dasd_delete_device(struct dasd_device *device) { struct ccw_device *cdev; struct dasd_devmap *devmap; + unsigned long flags; /* First remove device pointer from devmap. */ devmap = dasd_find_busid(device->cdev->dev.bus_id); - if (IS_ERR(devmap)) - BUG(); + BUG_ON(IS_ERR(devmap)); spin_lock(&dasd_devmap_lock); if (devmap->device != device) { spin_unlock(&dasd_devmap_lock); @@ -555,9 +594,16 @@ dasd_delete_device(struct dasd_device *device) devmap->device = NULL; spin_unlock(&dasd_devmap_lock); - /* Drop ref_count by 2, one for the devmap reference and - * one for the passed reference. */ - atomic_sub(2, &device->ref_count); + /* Disconnect dasd_device structure from ccw_device structure. */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + device->cdev->dev.driver_data = NULL; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + /* + * Drop ref_count by 3, one for the devmap reference, one for + * the cdev reference and one for the passed reference. + */ + atomic_sub(3, &device->ref_count); /* Wait for reference counter to drop to zero. */ wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); @@ -566,9 +612,6 @@ dasd_delete_device(struct dasd_device *device) cdev = device->cdev; device->cdev = NULL; - /* Disconnect dasd_devmap structure from ccw_device structure. */ - cdev->dev.driver_data = NULL; - /* Put ccw_device structure. */ put_device(&cdev->dev); @@ -586,23 +629,34 @@ dasd_put_device_wake(struct dasd_device *device) wake_up(&dasd_delete_wq); } +/* + * Return dasd_device structure associated with cdev. + * This function needs to be called with the ccw device + * lock held. It can be used from interrupt context. + */ +struct dasd_device * +dasd_device_from_cdev_locked(struct ccw_device *cdev) +{ + struct dasd_device *device = cdev->dev.driver_data; + + if (!device) + return ERR_PTR(-ENODEV); + dasd_get_device(device); + return device; +} + /* * Return dasd_device structure associated with cdev. */ struct dasd_device * dasd_device_from_cdev(struct ccw_device *cdev) { - struct dasd_devmap *devmap; struct dasd_device *device; + unsigned long flags; - device = ERR_PTR(-ENODEV); - spin_lock(&dasd_devmap_lock); - devmap = cdev->dev.driver_data; - if (devmap && devmap->device) { - device = devmap->device; - dasd_get_device(device); - } - spin_unlock(&dasd_devmap_lock); + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + device = dasd_device_from_cdev_locked(cdev); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); return device; } @@ -628,35 +682,87 @@ dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) } static ssize_t -dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +dasd_ro_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) { struct dasd_devmap *devmap; - int ro_flag; + int val; + char *endp; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); - ro_flag = buf[0] == '1'; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + spin_lock(&dasd_devmap_lock); - if (ro_flag) + if (val) devmap->features |= DASD_FEATURE_READONLY; else devmap->features &= ~DASD_FEATURE_READONLY; if (devmap->device) devmap->device->features = devmap->features; if (devmap->device && devmap->device->gdp) - set_disk_ro(devmap->device->gdp, ro_flag); + set_disk_ro(devmap->device->gdp, val); spin_unlock(&dasd_devmap_lock); return count; } static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); +/* + * erplog controls the logging of ERP related data + * (e.g. failing channel programs). + */ +static ssize_t +dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int erplog; + + devmap = dasd_find_busid(dev->bus_id); + if (!IS_ERR(devmap)) + erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; + else + erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; + return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); +} + +static ssize_t +dasd_erplog_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int val; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + if (val) + devmap->features |= DASD_FEATURE_ERPLOG; + else + devmap->features &= ~DASD_FEATURE_ERPLOG; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + return count; +} + +static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); /* * use_diag controls whether the driver should use diag rather than ssch * to talk to the device */ -static ssize_t +static ssize_t dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; @@ -671,21 +777,27 @@ dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) } static ssize_t -dasd_use_diag_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +dasd_use_diag_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) { struct dasd_devmap *devmap; ssize_t rc; - int use_diag; + int val; + char *endp; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); - use_diag = buf[0] == '1'; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + spin_lock(&dasd_devmap_lock); /* Changing diag discipline flag is only allowed in offline state. */ rc = count; if (!devmap->device) { - if (use_diag) + if (val) devmap->features |= DASD_FEATURE_USEDIAG; else devmap->features &= ~DASD_FEATURE_USEDIAG; @@ -695,30 +807,144 @@ dasd_use_diag_store(struct device *dev, struct device_attribute *attr, const cha return rc; } -static -DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); +static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); + +static ssize_t +dasd_discipline_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + ssize_t len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (!IS_ERR(device) && device->discipline) { + len = snprintf(buf, PAGE_SIZE, "%s\n", + device->discipline->name); + dasd_put_device(device); + } else + len = snprintf(buf, PAGE_SIZE, "none\n"); + return len; +} + +static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); static ssize_t -dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *buf) +dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; - char *dname; + int alias; + devmap = dasd_find_busid(dev->bus_id); spin_lock(&dasd_devmap_lock); - dname = "none"; - devmap = dev->driver_data; - if (devmap && devmap->device && devmap->device->discipline) - dname = devmap->device->discipline->name; + if (!IS_ERR(devmap)) + alias = devmap->uid.alias; + else + alias = 0; spin_unlock(&dasd_devmap_lock); - return snprintf(buf, PAGE_SIZE, "%s\n", dname); + + return sprintf(buf, alias ? "1\n" : "0\n"); } -static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); +static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); + +static ssize_t +dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + char *vendor; + + devmap = dasd_find_busid(dev->bus_id); + spin_lock(&dasd_devmap_lock); + if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) + vendor = devmap->uid.vendor; + else + vendor = ""; + spin_unlock(&dasd_devmap_lock); + + return snprintf(buf, PAGE_SIZE, "%s\n", vendor); +} + +static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); + +#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ + /* SSID */ 4 + 1 + /* unit addr */ 2 + 1) + +static ssize_t +dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + char uid[UID_STRLEN]; + + devmap = dasd_find_busid(dev->bus_id); + spin_lock(&dasd_devmap_lock); + if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) + snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x", + devmap->uid.vendor, devmap->uid.serial, + devmap->uid.ssid, devmap->uid.unit_addr); + else + uid[0] = 0; + spin_unlock(&dasd_devmap_lock); + + return snprintf(buf, PAGE_SIZE, "%s\n", uid); +} + +static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); + +/* + * extended error-reporting + */ +static ssize_t +dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int eer_flag; + + devmap = dasd_find_busid(dev->bus_id); + if (!IS_ERR(devmap) && devmap->device) + eer_flag = dasd_eer_enabled(devmap->device); + else + eer_flag = 0; + return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_eer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int val, rc; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + if (!devmap->device) + return -ENODEV; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + if (val) { + rc = dasd_eer_enable(devmap->device); + if (rc) + return rc; + } else + dasd_eer_disable(devmap->device); + return count; +} + +static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); static struct attribute * dasd_attrs[] = { &dev_attr_readonly.attr, &dev_attr_discipline.attr, + &dev_attr_alias.attr, + &dev_attr_vendor.attr, + &dev_attr_uid.attr, &dev_attr_use_diag.attr, + &dev_attr_eer_enabled.attr, + &dev_attr_erplog.attr, NULL, }; @@ -726,6 +952,72 @@ static struct attribute_group dasd_attr_group = { .attrs = dasd_attrs, }; +/* + * Return copy of the device unique identifier. + */ +int +dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(cdev->dev.bus_id); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + spin_lock(&dasd_devmap_lock); + *uid = devmap->uid; + spin_unlock(&dasd_devmap_lock); + return 0; +} + +/* + * Register the given device unique identifier into devmap struct. + * In addition check if the related storage server subsystem ID is already + * contained in the dasd_server_ssid_list. If subsystem ID is not contained, + * create new entry. + * Return 0 if server was already in serverlist, + * 1 if the server was added successful + * <0 in case of error. + */ +int +dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) +{ + struct dasd_devmap *devmap; + struct dasd_server_ssid_map *srv, *tmp; + + devmap = dasd_find_busid(cdev->dev.bus_id); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + /* generate entry for server_ssid_map */ + srv = (struct dasd_server_ssid_map *) + kzalloc(sizeof(struct dasd_server_ssid_map), GFP_KERNEL); + if (!srv) + return -ENOMEM; + strncpy(srv->sid.vendor, uid->vendor, sizeof(srv->sid.vendor) - 1); + strncpy(srv->sid.serial, uid->serial, sizeof(srv->sid.serial) - 1); + srv->sid.ssid = uid->ssid; + + /* server is already contained ? */ + spin_lock(&dasd_devmap_lock); + devmap->uid = *uid; + list_for_each_entry(tmp, &dasd_server_ssid_list, list) { + if (!memcmp(&srv->sid, &tmp->sid, + sizeof(struct system_id))) { + kfree(srv); + srv = NULL; + break; + } + } + + /* add servermap to serverlist */ + if (srv) + list_add(&srv->list, &dasd_server_ssid_list); + spin_unlock(&dasd_devmap_lock); + + return (srv ? 1 : 0); +} +EXPORT_SYMBOL_GPL(dasd_set_uid); + /* * Return value of the specified feature. */ @@ -736,7 +1028,7 @@ dasd_get_feature(struct ccw_device *cdev, int feature) devmap = dasd_find_busid(cdev->dev.bus_id); if (IS_ERR(devmap)) - return (int) PTR_ERR(devmap); + return PTR_ERR(devmap); return ((devmap->features & feature) != 0); } @@ -752,7 +1044,7 @@ dasd_set_feature(struct ccw_device *cdev, int feature, int flag) devmap = dasd_find_busid(cdev->dev.bus_id); if (IS_ERR(devmap)) - return (int) PTR_ERR(devmap); + return PTR_ERR(devmap); spin_lock(&dasd_devmap_lock); if (flag) @@ -788,8 +1080,10 @@ dasd_devmap_init(void) dasd_max_devindex = 0; for (i = 0; i < 256; i++) INIT_LIST_HEAD(&dasd_hashlists[i]); - return 0; + /* Initialize servermap structure. */ + INIT_LIST_HEAD(&dasd_server_ssid_list); + return 0; } void